export default {
  namespaced:true,
  
  state:()=>({
    //购物车的数组，用来存储购物车中每个商品的信息对象
    //每个商品的信息对象，都包含如下6个属性：
    //{goods_id,goods_name,goods_price,goods_count,goods_small_logo,goods_state}
    cart:JSON.parse(uni.getStorageSync('cart') || '[]')
  }),
  
  mutations:{
    addToCart(state,goods){
     const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
     // console.log(findResult);
     if(!findResult) {
       state.cart.push(goods)
     }else{
       findResult.goods_count++
     }
     // console.log(state.cart);
     this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    //更新购物车中商品的勾选状态
    updateGoodsState(state,goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if(findResult) {
        findResult.goods_state = goods.goods_state
        this.commit('m_cart/saveToStorage')
      }
    },
    //更新商品的数量
    updateGoodsCount(state, goods){
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResult) {
        findResult.goods_count = goods.goods_count
        this.commit('m_cart/saveToStorage')
      }
    },
    //根据id删除商品
    removeGoodsById(state, goods_id){
      state.cart = state.cart.filter(x => x.goods_id !== goods_id)
        this.commit('m_cart/saveToStorage')
    },
    //更新购物车中所有商品的勾选状态
    updateAllGoodsState(state,newState) {
      state.cart.forEach(x => x.goods_state = newState)
      this.commit('m_cart/saveToStorage')
    }
  },
  
  getters:{
    //购物车中所有商品的总数量
    total(state) {
/*      let c = 0
      state.cart.forEach(x => c += x.goods_count)
      return c */
      return state.cart.reduce((total,item) => total += item.goods_count, 0)
    },
    //购物车中已勾选商品的总数量
    checkedCount(state){
      return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count,0)
    },
    //已勾选商品的总价格
    checkedGoodsAmount(state){
      return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count * item.goods_price,0).toFixed(2)
    }
  }
}